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<li class="navelem"><a class="el" href="namespace_quant_lib.html">QuantLib</a></li><li class="navelem"><a class="el" href="class_quant_lib_1_1_tree_lattice.html">TreeLattice</a></li>  </ul>
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<a href="#pub-methods">Public Member Functions</a> &#124;
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<div class="title">TreeLattice&lt; Impl &gt; Class Template Reference<div class="ingroups"><a class="el" href="group__lattices.html">Lattice methods</a></div></div>  </div>
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<p>Tree-based lattice-method base class.  
 <a href="class_quant_lib_1_1_tree_lattice.html#details">More...</a></p>

<p><code>#include &lt;ql/methods/lattices/lattice.hpp&gt;</code></p>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:af64044578078d5872bb088b0a6892a6f"><td class="memItemLeft" align="right" valign="top"><a id="af64044578078d5872bb088b0a6892a6f"></a>
&#160;</td><td class="memItemRight" valign="bottom"><b>TreeLattice</b> (const <a class="el" href="class_quant_lib_1_1_time_grid.html">TimeGrid</a> &amp;timeGrid, <a class="el" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77">Size</a> n)</td></tr>
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<tr class="inherit_header pub_methods_class_quant_lib_1_1_lattice"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_quant_lib_1_1_lattice')"><img src="closed.png" alt="-"/>&#160;Public Member Functions inherited from <a class="el" href="class_quant_lib_1_1_lattice.html">Lattice</a></td></tr>
<tr class="memitem:aa11e1abb76c37d91d43b0e0fd132f9c4 inherit pub_methods_class_quant_lib_1_1_lattice"><td class="memItemLeft" align="right" valign="top"><a id="aa11e1abb76c37d91d43b0e0fd132f9c4"></a>
&#160;</td><td class="memItemRight" valign="bottom"><b>Lattice</b> (const <a class="el" href="class_quant_lib_1_1_time_grid.html">TimeGrid</a> &amp;timeGrid)</td></tr>
<tr class="separator:aa11e1abb76c37d91d43b0e0fd132f9c4 inherit pub_methods_class_quant_lib_1_1_lattice"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab1b4f3ee63c7fc18845e10236dd5df8d inherit pub_methods_class_quant_lib_1_1_lattice"><td class="memItemLeft" align="right" valign="top"><a id="ab1b4f3ee63c7fc18845e10236dd5df8d"></a>
const <a class="el" href="class_quant_lib_1_1_time_grid.html">TimeGrid</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>timeGrid</b> () const</td></tr>
<tr class="separator:ab1b4f3ee63c7fc18845e10236dd5df8d inherit pub_methods_class_quant_lib_1_1_lattice"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a85dadec35b0b9775e93b8c0d826447ba inherit pub_methods_class_quant_lib_1_1_lattice"><td class="memItemLeft" align="right" valign="top"><a id="a85dadec35b0b9775e93b8c0d826447ba"></a>
virtual <a class="el" href="class_quant_lib_1_1_disposable.html">Disposable</a>&lt; <a class="el" href="class_quant_lib_1_1_array.html">Array</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><b>grid</b> (<a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a>) const =0</td></tr>
<tr class="separator:a85dadec35b0b9775e93b8c0d826447ba inherit pub_methods_class_quant_lib_1_1_lattice"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="member-group"></a>
Lattice interface</h2></td></tr>
<tr class="memitem:a3c97e0e3435a61b1832d2977130765f3"><td class="memItemLeft" align="right" valign="top"><a id="a3c97e0e3435a61b1832d2977130765f3"></a>
std::vector&lt; <a class="el" href="class_quant_lib_1_1_array.html">Array</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><b>statePrices_</b></td></tr>
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<tr class="memitem:aadecec230a2b57534911ed193bffdb5b"><td class="memItemLeft" align="right" valign="top"><a id="aadecec230a2b57534911ed193bffdb5b"></a>
void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_tree_lattice.html#aadecec230a2b57534911ed193bffdb5b">initialize</a> (<a class="el" href="class_quant_lib_1_1_discretized_asset.html">DiscretizedAsset</a> &amp;, <a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> t) const</td></tr>
<tr class="memdesc:aadecec230a2b57534911ed193bffdb5b"><td class="mdescLeft">&#160;</td><td class="mdescRight">initialize an asset at the given time. <br /></td></tr>
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<tr class="memitem:a76086cb813dfb54bedee9ccac8946988"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_tree_lattice.html#a76086cb813dfb54bedee9ccac8946988">rollback</a> (<a class="el" href="class_quant_lib_1_1_discretized_asset.html">DiscretizedAsset</a> &amp;, <a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> to) const</td></tr>
<tr class="separator:a76086cb813dfb54bedee9ccac8946988"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab295d7d0092f6d1fc6a43b74f21afd2c"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_tree_lattice.html#ab295d7d0092f6d1fc6a43b74f21afd2c">partialRollback</a> (<a class="el" href="class_quant_lib_1_1_discretized_asset.html">DiscretizedAsset</a> &amp;, <a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a> to) const</td></tr>
<tr class="separator:ab295d7d0092f6d1fc6a43b74f21afd2c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad3c902f7e755ead81aa81e843571d7f2"><td class="memItemLeft" align="right" valign="top"><a id="ad3c902f7e755ead81aa81e843571d7f2"></a>
<a class="el" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78">Real</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_tree_lattice.html#ad3c902f7e755ead81aa81e843571d7f2">presentValue</a> (<a class="el" href="class_quant_lib_1_1_discretized_asset.html">DiscretizedAsset</a> &amp;) const</td></tr>
<tr class="memdesc:ad3c902f7e755ead81aa81e843571d7f2"><td class="mdescLeft">&#160;</td><td class="mdescRight">Computes the present value of an asset using Arrow-Debrew prices. <br /></td></tr>
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<tr class="memitem:aa459bdf933b1d71b3647d1be3ea625c1"><td class="memItemLeft" align="right" valign="top"><a id="aa459bdf933b1d71b3647d1be3ea625c1"></a>
const <a class="el" href="class_quant_lib_1_1_array.html">Array</a> &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>statePrices</b> (<a class="el" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77">Size</a> i) const</td></tr>
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<tr class="memitem:abdfae8e430bc8e203480d0b2b778ff5b"><td class="memItemLeft" align="right" valign="top"><a id="abdfae8e430bc8e203480d0b2b778ff5b"></a>
void&#160;</td><td class="memItemRight" valign="bottom"><b>stepback</b> (<a class="el" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77">Size</a> i, const <a class="el" href="class_quant_lib_1_1_array.html">Array</a> &amp;values, <a class="el" href="class_quant_lib_1_1_array.html">Array</a> &amp;newValues) const</td></tr>
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void&#160;</td><td class="memItemRight" valign="bottom"><b>computeStatePrices</b> (<a class="el" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77">Size</a> until) const</td></tr>
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Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pro_methods_class_quant_lib_1_1_curiously_recurring_template"><td colspan="2" onclick="javascript:toggleInherit('pro_methods_class_quant_lib_1_1_curiously_recurring_template')"><img src="closed.png" alt="-"/>&#160;Protected Member Functions inherited from <a class="el" href="class_quant_lib_1_1_curiously_recurring_template.html">CuriouslyRecurringTemplate&lt; Impl &gt;</a></td></tr>
<tr class="memitem:af644e65b081eafdcfdf59fed1e0d50ff inherit pro_methods_class_quant_lib_1_1_curiously_recurring_template"><td class="memItemLeft" align="right" valign="top"><a id="af644e65b081eafdcfdf59fed1e0d50ff"></a>
Impl &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>impl</b> ()</td></tr>
<tr class="separator:af644e65b081eafdcfdf59fed1e0d50ff inherit pro_methods_class_quant_lib_1_1_curiously_recurring_template"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a347ce8909f609d980047e6d1a8c6c444 inherit pro_methods_class_quant_lib_1_1_curiously_recurring_template"><td class="memItemLeft" align="right" valign="top"><a id="a347ce8909f609d980047e6d1a8c6c444"></a>
const Impl &amp;&#160;</td><td class="memItemRight" valign="bottom"><b>impl</b> () const</td></tr>
<tr class="separator:a347ce8909f609d980047e6d1a8c6c444 inherit pro_methods_class_quant_lib_1_1_curiously_recurring_template"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="inherit_header pro_attribs_class_quant_lib_1_1_lattice"><td colspan="2" onclick="javascript:toggleInherit('pro_attribs_class_quant_lib_1_1_lattice')"><img src="closed.png" alt="-"/>&#160;Protected Attributes inherited from <a class="el" href="class_quant_lib_1_1_lattice.html">Lattice</a></td></tr>
<tr class="memitem:ab90fa1dcf13b5f32d2e434defca13d21 inherit pro_attribs_class_quant_lib_1_1_lattice"><td class="memItemLeft" align="right" valign="top"><a id="ab90fa1dcf13b5f32d2e434defca13d21"></a>
<a class="el" href="class_quant_lib_1_1_time_grid.html">TimeGrid</a>&#160;</td><td class="memItemRight" valign="bottom"><b>t_</b></td></tr>
<tr class="separator:ab90fa1dcf13b5f32d2e434defca13d21 inherit pro_attribs_class_quant_lib_1_1_lattice"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;class Impl&gt;<br />
class QuantLib::TreeLattice&lt; Impl &gt;</h3>

<p>Tree-based lattice-method base class. </p>
<p>This class defines a lattice method that is able to rollback (with discount) a discretized asset object. It will be based on one or more trees.</p>
<p>Derived classes must implement the following interface: </p><div class="fragment"><div class="line"><span class="keyword">public</span>:</div>
<div class="line">  <a class="code" href="group__types.html#ga642a971a0bcbbd2fb26c35e1a06e5761" title="discount factor between dates">DiscountFactor</a> discount(<a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> i, <a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> index) <span class="keyword">const</span>;</div>
<div class="line">  <a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> descendant(<a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> i, <a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> index, <a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> branch) <span class="keyword">const</span>;</div>
<div class="line">  <a class="code" href="group__types.html#ga4bdf4bfe76b9ffa6fa64c47d8bfa0c78" title="real number">Real</a> probability(<a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> i, <a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> index, <a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> branch) <span class="keyword">const</span>;</div>
</div><!-- fragment --><p> and may implement the following: </p><div class="fragment"><div class="line"><span class="keyword">public</span>:</div>
<div class="line">  <span class="keywordtype">void</span> stepback(<a class="code" href="group__types.html#gaf38bdb4c54463b1f456655efa95b5c77" title="size of a container">Size</a> i,</div>
<div class="line">                <span class="keyword">const</span> Array&amp; values,</div>
<div class="line">                Array&amp; newValues) <span class="keyword">const</span>;</div>
</div><!-- fragment --> </div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a76086cb813dfb54bedee9ccac8946988"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a76086cb813dfb54bedee9ccac8946988">&#9670;&nbsp;</a></span>rollback()</h2>

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          <td class="memname">void rollback </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="class_quant_lib_1_1_discretized_asset.html">DiscretizedAsset</a> &amp;&#160;</td>
          <td class="paramname">, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a>&#160;</td>
          <td class="paramname"><em>to</em>&#160;</td>
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          <td>)</td>
          <td></td><td> const</td>
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<p>Roll back an asset until the given time, performing any needed adjustment. </p>

<p>Implements <a class="el" href="class_quant_lib_1_1_lattice.html#ac284e0bd252bb0977c06d28bdefdfc06">Lattice</a>.</p>

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<a id="ab295d7d0092f6d1fc6a43b74f21afd2c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ab295d7d0092f6d1fc6a43b74f21afd2c">&#9670;&nbsp;</a></span>partialRollback()</h2>

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          <td class="memname">void partialRollback </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="class_quant_lib_1_1_discretized_asset.html">DiscretizedAsset</a> &amp;&#160;</td>
          <td class="paramname">, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="group__types.html#ga14fb8fca43a68f4168654e1f9f7e22f7">Time</a>&#160;</td>
          <td class="paramname"><em>to</em>&#160;</td>
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          <td></td>
          <td>)</td>
          <td></td><td> const</td>
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<p>Roll back an asset until the given time, but do not perform the final adjustment.</p>
<dl class="caveats"><dt><b><a class="el" href="caveats.html#_caveats000116">Warning:</a></b></dt><dd>In version 0.3.7 and earlier, this method was called rollAlmostBack method and performed pre-adjustment. This is no longer true; when migrating your code, you'll have to replace calls such as: </dd></dl>
<div class="fragment"><div class="line">method-&gt;rollAlmostBack(asset,t);</div>
</div><!-- fragment --><p> with the two statements: </p><div class="fragment"><div class="line">method-&gt;partialRollback(asset,t);</div>
<div class="line">asset-&gt;preAdjustValues();</div>
</div><!-- fragment --> 
<p>Implements <a class="el" href="class_quant_lib_1_1_lattice.html#a014c376879c97eb1268c460dfeeebb4d">Lattice</a>.</p>

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